not any time soon,i specialise in leadwork and spent the last 22 years working on roofs,there are some jobs that have to be welded or need heat,felt flat roofing being the main one
In your opinion, why would a roof like this burn so quickly? Did the tiles burn?
depends on what the roof was made out of,concrete tiles or natural slate wont,but some of the man made imitation slate tiles are resin based.
the biggest issue i would imadgine would be the roof felt,it would more than likely be the old bitumen based felt wich degrades over time and goes brittle and very flammable,add 20 year old bone dry timber and resin based slates and you have one hell of a fire risk.on re-roofing jobs they used to burn old roofing materials,the speed they burn at and the heat they give off is alarming.
some times you have to weld in position,but there are ways and means of limiting the fire risk,which were possibly ignored by the look of it eeeekkk.
still trying to find out who it was,as there are not that many true leadworkers left,but plenty of people who think they are